Plant growth regulator use precautions
1. Accurate preparation and use concentration
Plant growth regulators use a small concentration, the requirements are very accurate, and the concentration is too high, which will delay crop growth, deformity, flower falling, root growth stop and even death.
2. Spray carefully, master the treatment site and treatment period
When applying the plant growth regulator, mark it to prevent repeated application. For example, when preparing 2,4-D, it can be marked with red and blue ink or soil, and it can be sprayed onto the shoots and leaves, otherwise it will easily cause deformity. The treatment period should be strictly controlled. For example, gibberellin treatment of cucumber seedlings promotes male flowers, and treatment of cucumber young melons preserves flowers and preserves fruit and promotes growth; ethephon promotes female flowers at seedling stage; 2,4-D treats tomato, in flower just When the opening is bright yellow, the smear effect is the best, and it is ineffective for the treatment of unopened green flower buds and flowers with dark yellow flowers. The treatment site is mastered according to different crop growth regulators and the purpose of use, such as 2,4-D treatment of solanaceous fruit, application of flower handle; anti-falling can spray inflorescence; 2,4-D treatment of cucumber young fruit, smearing melon , to prevent the application of parts to the melon.
3. Master the concentration according to the environment and conditions at the time of treatment
When a plant growth regulator is applied, it is generally used at a low concentration at a low temperature and at a high temperature. Generally applied on sunny days, the plants in the cloudy days are slow to run, which may cause phytotoxicity. If tomato is treated with anti-fallin, use 50mg/L at 20°C or below, 25mg/L at 20~30°C, and use 10mg/L at 30°C or above. After treatment, pay attention to the temperature change. If the temperature rises rapidly after treatment, it is easy to have abnormal phenomena such as deformed fruit. For example, when the tomato is ripened after harvesting, the temperature should be 20~25°C.
4. Strengthen water and fertilizer management
After the melon and fruit vegetables are treated with plant growth regulators, a large number of young melons, young fruits or accelerated plant growth are often formed, and water and fertilizer management must be kept up to avoid malnutrition, so that the formed organs stop growing, and some deformities should be removed. fruit.
5. How to use plant growth regulators
In daily production, the application method of the plant growth regulator used by us varies depending on the type, application object and purpose of use, and some commonly used application methods are briefly introduced.
Spraying most of the plant growth regulators can be sprayed, and the plants have a systemic adsorption function for such plant growth regulators. For example, sodium nitrophenolate, amine fresh ester, sodium α-naphthylacetate, DCPTA, ketamine, paclobutrazol, brassinolide, etc., when applied, firstly spray the plants at the corresponding concentration as required, requiring droplets to be fine and uniform. Moisture at the spray site. At the same time, in order to make the agent easy to adhere to the surface of the plant, a small amount of a surfactant (such as washing powder, sodium dodecylbenzenesulfonate, etc.) and other adjuvants may be added to the agent to increase the adhesion of the agent.
Soaking is often used to promote rooting, ripening fruits, storage and preservation. For example, when the woody plant is transplanted, it is placed in 50 mg/L of succinic acid, soaked for 12~24 hours, and then directly inserted into the seedbed. The quick-drying method can also be used. For example, after mixing sodium naphthaleneacetate with talc powder by 1:1 000, the lower part of the cuttings is soaked with water, and then a little powder is placed on the seedbed. Storage and fresh-keeping can be used for fresh cut flowers. The flowers are directly immersed in 10 mg/L dinitrophenol solution and stored at a low temperature of 2~5 °C to prolong the shelf life.
Wipe the solution to a certain part of the plant. The ointment containing the medicament is directly applied to the treatment site, and is mostly applied to the wound to promote rooting and wound healing. The high-altitude bead incision smear method can be used for the reproduction of expensive and difficult-to-root flowers by cutting the branches to expose the phloem, applying the ointment containing the medicament to the incision, and wrapping the outer surface with a film to prevent evaporation of water.
Watering the plant growth regulator into an aqueous solution, directly in the soil or mixed with fertilizers, such as in the greenhouse vegetable cultivation process, sodium nitrophenolate can be applied together with the fertilization. Another example is the potted flower. The amount of solution required depends on the size of the plant and the pot. Generally, the diameter of the 9~12cm caliber pot is 200~300mL. In order to promote flowering of plants and control the growth of stems and branches of plant strains, it can be watered with 0.1% chlormequat solution.
Seed dressing and seed coating methods are mainly used for seed treatment. When the seed is treated with a bactericide, an insecticide, a micronutrient or the like, a plant growth regulator may be appropriately added. The seed dressing method is to mix the medicine and the seed and mix well, so that the surface of the seed is stained with the medicine. For example, the medicine is sprayed on the seed with a watering can, and the mixture is evenly mixed and then sown, like seed dressing with amine fresh ester, which can stimulate seed germination and promote rooting. The seed coating method uses a special dosage form seed coating agent to wrap it on the outside of the seed to form a film with a certain thickness. In addition to promoting seed germination, it can also achieve the purpose of controlling pests and diseases, increasing mineral nutrition, and regulating plant growth.
When applying base fertilizer to crops, it can add some plant growth regulators to promote rooting and germination of crops, promote the absorption and utilization of fertilizers by crops, and improve the ability of resistance to disease and disease.
Drip application Recently, in afforestation and gardening, more and more nutrients such as plant growth regulators and micro-fertilizers have been applied to trees. This method is simple to apply, easy to operate, cost-effective, and high in utilization.
With the continuous research on plant growth regulators and their application methods, we have reason to believe that more and better plant growth regulator application methods will emerge in the future, bringing greater development to agricultural production.
(Yuege Fertilizer Network comprehensive finishing, please indicate the source, please contact 13203809264 for details)
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